OMC Dark Pool Activity
ATS off-exchange volume intelligence · Week of 2026-07-20
OMC dark pool volume for the week of 2026-07-20: 3.4M shares traded across 26 ATS venues with a total notional value of $268.9M. Volume is down 9.1% week-over-week. Off-exchange dark pool transactions account for 24.6% of total OMC market volume — elevated above the typical 10–14% institutional baseline, potentially signaling active accumulation or distribution. Primary routing venues include , UBS ATS, INTELLIGENT CROSS LLC.
Dark pool activity in OMC reflects institutional order flow executing on Alternative Trading Systems (ATS) registered with the SEC — private venues where large-block trades are matched away from public exchanges to minimize price impact. StonkWhisper ingests FINRA-published ATS volume data to track these off-exchange flows. Sustained elevation in dark pool percentage — particularly when concentrated at specific venues — can indicate institutional accumulation or distribution ahead of significant price moves. The interactive charts below show 12-week historical volume and complete venue breakdown for OMC.
Weekly History
| Week | Shares | DP % | WoW |
|---|---|---|---|
| 2026-07-20 | 3.4M | 24.6% | -9.1% |
| 2026-07-13 | 3.7M | — | +5.9% |
| 2026-07-06 | 3.5M | — | -22.4% |
| 2026-06-29 | 4.5M | — | -4.1% |
| 2026-06-22 | 4.7M | — | -3.9% |
| 2026-06-15 | 4.9M | — | +19.8% |
| 2026-06-08 | 4.1M | — | +10.3% |
| 2026-06-01 | 3.7M | — | +64.6% |
| 2026-05-25 | 2.2M | — | -52.9% |
| 2026-05-18 | 4.8M | — | -13.8% |
| 2026-05-11 | 5.5M | — | -7.0% |
| 2026-05-04 | 6.0M | — | -25.1% |